Finding an NTS Number

NTS numbers are used to index National Topographic System maps.  93G/15 is an example. The first part of the number, “93G,” references the 1:250 000 map  sheet. The “/15″ references a specific 1:50 000 map sheet within the coverage of the 93G 1:250 000 map.

Use one of the following methods to find the NTS number that you need:

Online Tools

  • TOPORAMA — Zoom in to the desired area of the map, and under Map Layers and Legend(s) check the Grids (NTS, Lat/Long, UTM) box.
  • Canadian Geographical Names Data Base — Search using the name of a city, town, lake, or any other geographical feature to find the corresponding NTS number.

Use Index Maps

These are located in the first drawer of the Canada topographic map collection in the map cabinets.

Finding an NTS Number | Geoffrey R. Weller Library


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